Save with a Pay Monthly SIM

SIM Only contracts offer better value because operators don't have to offset the cost of a mobile phone. Enabling you to get a bigger monthly allowance with more minutes, data and texts for your money. You also won’t have to pay any upfront cost.

Prices start at just £5 a month and a wide range of cheap SIM only deals are available. You’ll find our current top pick (or recommended deal) marked up in the plans. This is the deal which we believe offers the best value for money at the current time. But, we’d always recommended comparing all the SIM plans to find the one that best suits your needs.

Flexible Plans

SIM Only plans are available on a 12 month or 1 month contract lengths (30 day rolling contracts). That offers you a lot more flexibility compared to Pay Monthly phone plans which come with lengthy 24 month contracts.

12 month plans - Perfect for those looking for the best value as they are the cheapest SIM deals you can buy.

1 month rolling plans - Great for those looking for most flexibility. At the end of the month the plan will automatically renew (or roll) into the next month, unless you inform Three that you want to cancel.

Huge range of benefits on Three

SIM plans on Three come with a host of benefits. To make sure you don’t pay for things you don’t need there are two types of plans:

Unlimited Internet

SIM Only plans with unlimited data are available on a 1 month or 12 month contract. Three are the only UK network to offer truly unlimited data with no speed caps. All unlimited data plans also come with tethering and free worldwide roaming.

Unlimited Minutes

Those who love to talk might want to consider a plan with unlimited minutes, so they don’t incur any call charges. There are a wide range of choices available and they all come unlimited texts.

Frequently Asked Questions

What SIM size do I need for my phone?

The type of SIM card you need depends on the device you have. But, the good news is that when you order on Three you get a Trio SIM (or Multi SIM). A Trio SIM is a Nano, Micro and Standard SIM combined), so you don't need to worry about which size SIM you need.

Trio-SIM – Suitable for all phones. Simply pop-out the SIM size which you need (Standard, Micro or Nano).

Micro SIM - For use in newer smartphones. Including iPhone 4, iPhone 4S and many older android phone.

Standard SIM - For use in many older phones

Do plans come with 4G?

Yes, all Pay Monthly SIMs come with 4G at no extra cost. 4G data speeds are not limited like they can be on other networks, so you’ll always get the best possible performance.

Should you find yourself in an area without 4G coverage then you’ll automatically roll back onto Three’s 3G network.

Can I keep my number when switching?

Yes, you can easily keep your number when switching to a Three SIM plan. All you need to do is request a PAC code from your current network, wait for your new Three SIM card to arrive and fill out the form here.

PAC Codes (porting authorisation code) let you transfer your number when changing operator. Operators must give a PAC code by law within 2 hours of a request from a customer.

Is tethering (personal hotspot) included on SIM contracts?

Advanced Plans come with tethering and enable you to tether up to 30GB data to WiFi devices over a personal hotspot. You won’t be able to tether when roaming abroad with Feel At Home.

Tethering is not included with Essential Plans, but an add-on is available should you need to switch on tethering.

Is there a credit check when getting a SIM Contract?

Yes, a basic credit check is undertaken with a SIM Only contract. But, it is much less stringent than buying a contract phone because it doesn’t have to account for the value of the new phone.

Pay Monthly SIMs are great for those with a bad credit rating who can’t get a phone contract. They are a great way to begin recovering your credit rating.

Can I roam abroad with SIM deals?

Yes, Essential plans enable you to at no extra cost in 48 European countries. Advanced Plans enable you to roam in 60 countries across the world, including USA, Australia and many more.

You can use calls and texts to call home like you would in the UK. The only restrictions are that you only use 12GB of data abroad and tethering isn’t supported.

Is Go Binge included with SIM plans?

Yes, Go Binge comes with all Advanced Plans with 4GB of data or more. Streaming on Netflix, Soundcloud, Deezer and TV Player won’t come out of your data allowance.

There are no limits on how much streaming you can do per month and you can even Go Binge when roaming abroad with Feel At Home.

Can I get a SIM Contract for my iPhone?

Yes, simply order a SIM Contract and pop in the relevant SIM when it arrives. All orders come with a Trio SIM so you don’t need to worry about which type of SIM size you need.

Most modern iPhones, including the iPhone 7, iPhone 6S, iPhone 6 and iPhone SE use Nano SIMs. While, older models such as the iPhone 5 and iPhone 4S use Micro SIMs.

Both a Micro and Nano SIM are supplied as part of a Trio SIM, so simply pop out the one you need.

Will my unused data rollover to the next month?

Three plans don’t come with data rollover. But, there are a host of other benefits you don’t get elsewhere. They include unlimited streaming with Go Binge and tethering on selected plans.

What is a 1 month rolling contract?

A 1 month (or 30 day) rolling contract is a great way to enjoy the lower prices of a contract deal without having to commit to a lengthy contract.

Contracts automatically renew every 30 days unless you tell Three you want it to end. This makes it great if you are waiting for a new phone to launch, or want to buy a short-term SIM for using abroad.